With turnout up 50% from 2008, 34,570 US citizens living in 38 countries voted by internet, mail, fax or in person. Sanders took 69% of the vote to earn nine delegates to the national convention in August; Hillary Clinton took 31% and four.

In a statement greeting his win with Democrats living abroad, Sanders said: “This political revolution that is gaining momentum across America is now resonating all over the world.

“There is a clear path to victory as we begin the second half of the delegate selection process. We are waging a strong campaign and plan to take it all the way to the Democratic National Convention this summer in Philadelphia.”

Clinton won all five states that voted last week. The next Democratic votes on the US mainland are in Arizona, Utah and Idaho on Tuesday: 131 delegates are on offer.

While Clinton started Monday speaking at the pro-Israel Aipac conference in Washington DC, Sanders – who on Sunday admitted to having been “ creamed ” by Clinton in southern states but predicted gains out west – was campaigning in those western states. He was not scheduled to address Aipac.

Alaska, Hawaii and Washington will hold caucuses on Saturday, with 142 delegates at stake.

“DA volunteers worked around the clock and around the world over the past two weeks to verify and count every ballot cast,” said Democrats Abroad international secretary Julia Bryan, in a statement .

Democrats Abroad also provided vote tallies from countries around the world. In Afghanistan, for example, seven Democrats cast votes: two were for Clinton and five for Sanders.

One of Australia’s 873 Democratic voters supported the former Maryland governor Martin O’Malley, who dropped out of the race last month . Sanders won 635 Australian votes and Clinton 237. Sanders also won a landslide in Japan, 1178-176, and took handy wins in Mexico (838-545) and Russia (48-17).

The UK had the most voting Democrats of any country, with 4,610. Of those, 2,874 favoured Sanders.